A fireproof and explosion-proof cable

Abstract

The present invention discloses a fireproof and explosion-proof cable, comprising a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a filling layer, a tape layer, an armor layer, and an outer sheath. The outer wall of the tape layer is provided with an isolation layer, and the outer wall of the isolation layer is provided with a protective layer. The isolation layer and the protective layer are provided in multiple groups and are equidistantly distributed along the length of the cable. Due to the provision of the protective layer, when a fire occurs and the temperature around the outer sheath rises significantly, the generated high temperature will be absorbed by the expanded graphite in the first expansion chamber. After the expanded graphite expands, the first expansion chamber drives the concave block to move toward the convex block, so that the vent holes and the connecting holes are staggered and blocked, forming a heat-insulating protective layer, preventing the external high temperature from entering the cable through the vent holes and the connecting holes, and preventing the high temperature from entering the conductor core, causing the conductor core to overheat, causing a short circuit, or even the risk of explosion, thereby improving the safety and service life of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and more particularly to a fireproof and explosion-proof cable. Background Art

[0002] With the acceleration of industrialization and urbanization, the demand for safety and reliability in power and signal transmission systems is increasing. In high-risk environments such as the petrochemical industry, mining, electric power, and rail transit, cables must not only meet basic electrical conductivity requirements but also maintain functional integrity under extreme conditions (such as high temperatures, flames, and explosion shock). The shortcomings of traditional cables in fire and explosion resistance have become potential hazards that may lead to major safety accidents. Therefore, the research and development of fire and explosion-resistant cables has become a key focus in the cable industry.

[0003] Chinese patent application number CN201610777547.1 discloses a DC jumper fire-proof control cable for rail transit, which relates to the field of cables for rail transit. The cable includes a cable core unit protective layer, 5 to 8 cable core units are arranged inside the cable core unit protective layer, and an even number of cable cores are arranged inside the cable core unit; the cable core unit protective layer and each cable core unit are filled with filling material; each cable core includes a cable core protective layer and a conductor located inside the cable core protective layer; the cable core protective layer includes a fire-resistant layer, an insulating layer and an isolation layer arranged in sequence from the inside to the outside; the cable core unit protective layer includes a fire-insulating layer, an inner sheath, an armor layer and an outer sheath arranged in sequence from the inside to the outside. The present invention can significantly enhance the cable's fire resistance, impulse voltage resistance, mechanical damage resistance, explosion resistance, electromagnetic interference resistance, mechanical vibration resistance, overload resistance, high temperature resistance, corrosion resistance and other properties; the present invention can meet higher laying conditions and operating environment conditions and is suitable for promotion.

[0004] Although the above invention can meet higher laying conditions and operating environment conditions, during the long-term power supply process, the cable cannot promptly conduct the heat generated around the conductor to the outside of the cable, resulting in a high temperature inside the cable. This may cause the cable to catch fire during use, thereby affecting the safety of the cable and shortening the service life of the cable. When a fire occurs, the temperature around the cable will rise significantly, and the high temperature generated will be transmitted to the conductor core, causing the conductor core to overheat, causing a short circuit, and even the risk of explosion.

[0005] Therefore, in order to solve the above problems, it is necessary to provide a fireproof and explosion-proof cable. Summary of the Invention

[0006] The purpose of the present invention is to provide a fireproof and explosion-proof cable, which aims to solve the problem that during the long-term power supply process of the cable, the heat generated around the conductor cannot be promptly conducted to the outside of the cable, resulting in a high temperature inside the cable, which may cause the cable to catch fire during use, thereby affecting the safety of the cable and shortening the service life of the cable; when a fire occurs, the temperature around the cable will rise significantly, and the high temperature generated will be transmitted to the conductor core, causing the conductor core to overheat, causing a short circuit, and even the risk of explosion.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a fireproof and explosion-proof cable, comprising a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a filling layer, a tape layer, an armor layer, and an outer sheath, wherein the outer wall of the tape layer is covered with an isolation layer, and the outer wall of the isolation layer is covered with a protective layer, wherein the isolation layer and the protective layer are provided in multiple groups and are equidistantly distributed along the length of the cable;

[0008] The isolation layer includes a first expansion chamber, and the first expansion chamber is provided in plurality and is equidistantly distributed along the circumference of the outer wall of the wrapping layer. Each of the first expansion chambers is filled with hot expansion gas, and one side of each of the first expansion chambers is fixedly connected to a first cross block, and the other side of each of the first expansion chambers is fixedly connected to a second cross block, each of the second cross blocks is fixedly connected to the outer wall of the wrapping layer, and each of the first cross blocks is cross-slidingly connected to the corresponding second cross block.

[0009] Preferably, the outer wall of each of the first cross blocks is penetrated by a plurality of first ventilation grooves evenly distributed along the length direction of the cable, and a limiting groove is provided on the outer wall of the corresponding first cross block between each two adjacent first ventilation grooves, and the outer wall of each of the second cross blocks is penetrated by second ventilation grooves with the same number and corresponding positions as the first ventilation grooves.

[0010] Preferably, the protective layer includes a second expansion chamber arranged on the outer wall of the isolation layer, the number of the second expansion chambers is the same as that of the first expansion chambers and the positions correspond to each other, each of the second expansion chambers is filled with expanded graphite, and each of the second expansion chambers is fixedly connected to a protruding block at one end close to the first cross block, and each of the protruding blocks is fixedly connected to the inner wall of the armor layer, and each of the second expansion chambers is fixedly connected to a recessed block at one end close to the second cross block, and each of the recessed blocks can be slidably connected to the corresponding protruding block.

[0011] Preferably, a plurality of sliding blocks symmetrically arranged and equally distributed along the length direction of the cable are fixedly connected to both sides of the plug-in end of each protruding block, and a plurality of equally distributed ventilation holes are opened on the plug-in end of each protruding block.

[0012] Preferably, sliding grooves of the same number and corresponding positions as the sliding blocks are symmetrically opened on both sides of the insertion end of each recessed block, each sliding block is slidably connected in the corresponding sliding groove, and the outer wall of each recessed block is penetrated by connecting holes of the same number and corresponding positions as the ventilation holes.

[0013] Preferably, each of the recessed blocks is fixedly connected to a side close to the first cross block with a limit block having the same number and corresponding position as the limit slots on the corresponding first cross block, and each of the limit blocks is slidably connected in the corresponding limit slot.

[0014] Preferably, when the conductor continues to run and generates heat, the hot expansion gas in the first expansion chamber will absorb the heat emitted by the conductor and expand, and the expansion of the first expansion chamber will squeeze the first cross block to move toward the second cross block. When the first cross block is squeezed by the first expansion chamber and moves to the extreme position of the second cross block, the first ventilation groove and the second ventilation groove are connected to each other.

[0015] Preferably, when the first cross block moves toward the second cross block, the limiting groove on the outer wall of the first cross block will drive the recessed block to move by cooperating with the corresponding limiting block. When the first cross block moves to the extreme position toward the second cross block, the vent hole and the connecting hole are connected to each other.

[0016] Preferably, when the high temperature outside the outer sheath enters the interior of the cable, the high temperature will be absorbed by the expanded graphite in the first expansion chamber. After the expanded graphite expands, the first expansion chamber will drive the recessed block to move toward the protruding block, so that the vent hole and the connecting hole are staggered with each other.

[0017] Preferably, the insulating layer is made of cross-linked polyethylene and the outer sheath is made of polyvinyl chloride, both of which are flame-retardant and wear-resistant materials.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention provides an isolation layer. When the conductor continues to run and generates heat, the heat will enter the first expansion chamber. The heat-expanding gas absorbs the heat, causing the first expansion chamber to expand, which will drive the first cross block to move toward the second cross block. When the first cross block moves, the limiting groove on the outer wall of the first cross block will drive the recessed block to move by cooperating with the corresponding limiting block. When the first cross block moves to the extreme position, the first ventilation groove and the second ventilation groove are connected to each other. When the recessed block moves to the extreme position, the ventilation hole and the connecting hole are connected to each other. At this time, the heat generated by the conductor can be discharged through the first ventilation groove, the second ventilation groove, the ventilation hole, and the connecting hole. The heat generated around the conductor can be discharged in time, preventing the risk of fire caused by the high temperature generated inside the cable that cannot be discharged in time, thereby improving the performance and service life of the cable.

[0020] 2. The present invention provides a protective layer. When a fire causes the temperature around the outer sheath to rise sharply, the generated high temperature will be absorbed by the expanded graphite in the first expansion chamber. After the expanded graphite expands, the first expansion chamber drives the concave block to move toward the convex block, so that the vents and the connecting holes are staggered and blocked to form a heat-insulating protective layer, which prevents the external high temperature from entering the cable through the vents and the connecting holes, and prevents the high temperature from being transmitted to the conductor core, causing the conductor core to overheat, causing a short circuit, or even the risk of explosion, thereby improving the safety and service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 Schematic diagram of the distribution of the protective layer structure of the present invention;

[0023] Figure 3 This is a cross-sectional view of the staggered structure of the first ventilation groove, the second ventilation groove, the ventilation hole, and the connecting hole of the present invention;

[0024] Figure 4 This is a cross-sectional view of the communication structure of the first ventilation groove, the second ventilation groove, the ventilation hole, and the communication hole of the present invention;

[0025] Figure 5 Schematic diagram of the interlaced structure of the first cross block and the second cross block of the present invention;

[0026] Figure 6 This is a cross-sectional view of the limiting groove and limiting block structure of the present invention;

[0027] Figure 7 Schematic diagram of the explosion structure of the first cross block and the second cross block of the present invention;

[0028] Figure 8 This is a schematic diagram of the explosion structure of the protruding blocks and the recessed blocks of the present invention;

[0029] Figure 9 It is a cross-sectional view of the exploded structure of the protruding block and the recessed block of the present invention.

[0030] The figures are marked as follows: 11. conductor; 12. inner shielding layer; 13. insulating layer; 14. outer shielding layer; 15. filling layer; 16. tape layer; 17. armor layer; 18. outer sheath; 2. isolation layer; 21. first expansion chamber; 22. first cross block; 23. second cross block; 24. first ventilation groove; 25. limiting groove; 26. second ventilation groove; 3. protective layer; 31. second expansion chamber; 32. protruding block; 33. recessed block; 34. sliding block; 35. ventilation hole; 36. sliding groove, 37. connecting hole; 38. limiting block. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] During long-term power supply, the cable cannot conduct the heat generated around the conductor to the outside of the cable in time, resulting in a high temperature inside the cable. This may cause a fire hazard during the use of the cable, thus affecting the safety of the cable and shortening its service life.

[0034] like Figures 1 to 4 As shown, a fireproof and explosion-proof cable according to an embodiment of the present invention includes a conductor 11, an inner shielding layer 12, an insulating layer 13, an outer shielding layer 14, a filling layer 15, a tape layer 16, an armor layer 17 and an outer sheath 18. The outer wall of the tape layer 16 is provided with an isolation layer 2, and the outer wall of the isolation layer 2 is provided with a protective layer 3. The isolation layer 2 and the protective layer 3 are provided in multiple groups and are equidistantly distributed along the length of the cable.

[0035] like Figure 3 and Figure 4 As shown, the isolation layer 2 includes a first expansion chamber 21, and a plurality of first expansion chambers 21 are provided and equidistantly distributed along the circumference on the outer wall of the wrapping layer 16. Each first expansion chamber 21 is filled with hot expansion gas, and one side of each first expansion chamber 21 is fixedly connected to a first cross block 22, and the other side of each first expansion chamber 21 is fixedly connected to a second cross block 23. Each second cross block 23 is fixedly connected to the outer wall of the wrapping layer 16, and each first cross block 22 is cross-slidingly connected to the corresponding second cross block 23.

[0036] By setting thermal expansion gas in the first expansion chamber 21 , the thermal expansion gas absorbs heat and expands, causing the first expansion chamber 21 to expand, and the expansion of the first expansion chamber 21 pushes the first cross block 22 to move toward the second cross block 23 .

[0037] like Figures 5 to 7 As shown, the outer wall of each first cross block 22 is penetrated by a plurality of first ventilation grooves 24 evenly distributed along the length direction of the cable, and a limiting groove 25 is provided on the outer wall of the corresponding first cross block 22 between each two adjacent first ventilation grooves 24, and the outer wall of each second cross block 23 is penetrated by second ventilation grooves 26 with the same number and corresponding positions as the first ventilation grooves 24.

[0038] When the first cross block 22 moves to the extreme position of the second cross block 23 , the first ventilation groove 24 and the second ventilation groove 26 are connected to each other.

[0039] like Figure 3 and Figure 4 As shown, the protective layer 3 includes a second expansion chamber 31 arranged on the outer wall of the isolation layer 2. The number of the second expansion chambers 31 is the same as that of the first expansion chambers 21 and their positions correspond to each other. Each second expansion chamber 31 is fixedly connected to a protruding block 32 at one end close to the first cross block 22, and each protruding block 32 is fixedly connected to the inner wall of the armor layer 17. Each second expansion chamber 31 is fixedly connected to a recessed block 33 at one end close to the second cross block 23, and each recessed block 33 can be slidably connected to the corresponding protruding block 32.

[0040] like Figures 6 to 9 As shown, both sides of the plug-in end of each protruding block 32 are fixedly connected with a plurality of sliding blocks 34 equidistantly distributed and symmetrically arranged along the length direction of the cable, and the plug-in end of each protruding block 32 is provided with a plurality of equidistantly distributed ventilation holes 35, and both sides of the insertion end of each recessed block 33 are symmetrically provided with sliding grooves 36 with the same number and corresponding positions as the sliding blocks 34, and each sliding block 34 is slidably connected in the corresponding sliding groove 36, and the outer wall of each recessed block 33 is penetrated with connecting holes 37 with the same number and corresponding positions as the ventilation holes 35, and the side of each recessed block 33 close to the first cross block 22 is fixedly connected with a limit block 38 with the same number and corresponding positions as the upper limit groove 25 of the corresponding first cross block 22, and each limit block 38 is slidably connected in the corresponding limit groove 25.

[0041] When the first cross block 22 moves, the limit groove 25 on the outer wall of the first cross block 22 will drive the recessed block 33 to move by cooperating with the corresponding limit block 38. When the first cross block 22 moves to the extreme position, the first ventilation groove 24 and the second ventilation groove 26 will be connected to each other. When the recessed block 33 moves to the extreme position, the ventilation hole 35 and the connecting hole 37 will be connected to each other.

[0042] like Figures 1 to 9 As shown, when the conductor 11 continues to run and generate heat, the hot expansion gas in the first expansion chamber 21 will absorb the heat emitted by the conductor 11 and expand. The expansion of the first expansion chamber 21 will squeeze the first cross block 22 to move toward the second cross block 23. When the first cross block 22 is squeezed by the first expansion chamber 21 and moves to the extreme position of the second cross block 23, the first ventilation groove 24 and the second ventilation groove 26 will be connected to each other. When the first cross block 22 moves toward the second cross block 23, the limit groove 25 on the outer wall of the first cross block 22 will drive the recessed block 33 to move by cooperating with the corresponding limit block 38. When the first cross block 22 moves to the extreme position toward the second cross block 23, the ventilation hole 35 and the connecting hole 37 are connected to each other.

[0043] The insulating layer 13 is made of cross-linked polyethylene and the outer sheath 18 is made of polyvinyl chloride, both of which are flame-retardant and wear-resistant materials.

[0044] During specific use, when the conductor 11 continues to run and generate heat, the heat will diffuse to the surroundings and enter the first expansion chamber 21. The first expansion chamber 21 is filled with heat-expanding gas. The heat-expanding gas absorbs heat to cause the first expansion chamber 21 to expand, which will drive the first cross block 22 to move toward the second cross block 23. When the first cross block 22 moves, the limit groove 25 on the outer wall of the first cross block 22 will drive the recessed block 33 to move by cooperating with the corresponding limit block 38. When the first cross block 22 moves to the extreme position, the first ventilation groove 24 and the second ventilation groove 26 will be connected to each other. When the recessed block 33 moves to the extreme position, the vent 35 and the connecting hole 37 will be connected to each other. At this time, the heat generated by the conductor 11 can be discharged through the first ventilation groove 24, the second ventilation groove 26 and the vent 35 and the connecting hole 37.

[0045] To sum up, through the setting of the isolation layer 2, when the conductor 11 continues to run and generates heat, the heat will enter the first expansion chamber 21, and the hot expansion gas absorbs heat to cause the first expansion chamber 21 to expand, which will drive the first cross block 22 to move toward the second cross block 23. When the first cross block 22 moves, the limit groove 25 on the outer wall of the first cross block 22 will drive the recessed block 33 to move by cooperating with the corresponding limit block 38. When the first cross block 22 moves to the extreme position, the first ventilation groove 24 and the second ventilation groove 26 will be connected to each other. When the recessed block 33 moves to the extreme position, the vent 35 and the connecting hole 37 will be connected to each other. At this time, the heat generated by the conductor 11 can be discharged through the first ventilation groove 24, the second ventilation groove 26 and the vent 35 and the connecting hole 37, and the heat generated around the conductor can be discharged in time, preventing the risk of fire due to high temperature generated inside the cable that cannot be discharged in time, thereby improving the performance and service life of the cable.

[0046] Example 2

[0047] When a fire occurs, the temperature around the cable will rise significantly. The high temperature generated will be transmitted to the conductor core, causing the conductor core to overheat, which may cause a short circuit or even explosion. Therefore, this embodiment improves the device described in the above embodiment.

[0048] like Figure 3 and Figure 4 As shown, the protective layer 3 includes a second expansion chamber 31 arranged on the outer wall of the isolation layer 2. The number of the second expansion chambers 31 is the same as that of the first expansion chambers 21 and their positions correspond to each other. Each second expansion chamber 31 is filled with expanded graphite. The end of each second expansion chamber 31 close to the first cross block 22 is fixedly connected to a protruding block 32, and each protruding block 32 is fixedly connected to the inner wall of the armor layer 17. The end of each second expansion chamber 31 close to the second cross block 23 is fixedly connected to a recessed block 33, and each recessed block 33 can be slidably plugged into the corresponding protruding block 32.

[0049] like Figures 6 to 9 As shown, both sides of the plug-in end of each protruding block 32 are fixedly connected with a plurality of sliding blocks 34 equidistantly distributed and symmetrically arranged along the length direction of the cable, and the plug-in end of each protruding block 32 is provided with a plurality of equidistantly distributed ventilation holes 35, and both sides of the insertion end of each recessed block 33 are symmetrically provided with sliding grooves 36 with the same number and corresponding positions as the sliding blocks 34, and each sliding block 34 is slidably connected in the corresponding sliding groove 36, and the outer wall of each recessed block 33 is penetrated with connecting holes 37 with the same number and corresponding positions as the ventilation holes 35, and the side of each recessed block 33 close to the first cross block 22 is fixedly connected with a limit block 38 with the same number and corresponding positions as the upper limit groove 25 of the corresponding first cross block 22, and each limit block 38 is slidably connected in the corresponding limit groove 25.

[0050] like Figures 3 to 9 As shown, when the high temperature outside the outer sheath 18 enters the interior of the cable, the high temperature will be absorbed by the expanded graphite in the first expansion chamber 21. After the expanded graphite expands, the first expansion chamber 21 drives the recessed block 33 to move toward the protruding block 32, so that the vent hole 35 and the connecting hole 37 are staggered with each other.

[0051] During specific use, when a fire occurs and the temperature around the outer sheath 18 rises significantly, the generated high temperature will enter the interior of the cable through the outer sheath 18, and the high temperature will be absorbed by the expanded graphite in the first expansion chamber 21, causing the expanded graphite to expand. After the expanded graphite expands, the first expansion chamber 21 will drive the recessed block 33 to move toward the protruding block 32, so that the vent holes 35 and the connecting holes 37 are staggered and blocked, forming a heat-insulating protective layer to prevent the external high temperature from entering the interior of the cable through the vent holes 35 and the connecting holes 37.

[0052] It should be noted that since the fire temperature is much higher than the temperature generated by the conductor 11, when a fire occurs, the high temperature will be absorbed by the expanded graphite in the first expansion chamber 21 and expand, causing the vent holes 35 and the connecting holes 37 to be blocked in an alternating manner, and the vent holes 35 and the connecting holes 37 will not be connected due to the temperature generated by the conductor 11.

[0053] To sum up, through the provision of the protective layer 3, when a fire occurs and the temperature around the outer sheath 18 rises sharply, the high temperature generated will be absorbed by the expanded graphite in the first expansion chamber 21. After the expanded graphite expands, the first expansion chamber 21 will drive the recessed block 33 to move toward the protruding block 32, so that the vents 35 and the connecting holes 37 are staggered and blocked to form a heat-insulating protective layer, which prevents the external high temperature from entering the cable through the vents 35 and the connecting holes 37, and prevents the high temperature from entering the conductor core, causing the conductor core to overheat, causing a short circuit, or even the risk of explosion, thereby improving the safety and service life of the cable.

[0054] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fireproof and explosion-proof cable, comprising a conductor, an inner shielding layer, an insulating layer, an outer shielding layer, a filling layer, a tape layer, an armor layer and an outer sheath, characterized in that: The outer wall of the tape layer is covered with an isolation layer, and the outer wall of the isolation layer is covered with a protective layer. The isolation layer and the protective layer are provided in multiple groups and are equidistantly distributed along the length direction of the cable; The isolation layer includes a first expansion chamber, wherein the first expansion chambers are provided in plurality and are equidistantly distributed along the circumference of the outer wall of the tape layer, each of the first expansion chambers is filled with hot expansion gas, a first cross block is fixedly connected to one side of each of the first expansion chambers, a second cross block is fixedly connected to the other side of each of the first expansion chambers, each of the second cross blocks is fixedly connected to the outer wall of the tape layer, and each of the first cross blocks is cross-slidably connected to the corresponding second cross block; The outer wall of each first cross block is penetrated by a plurality of first ventilation grooves evenly distributed along the length direction of the cable, and a limiting groove is provided on the outer wall of the corresponding first cross block between every two adjacent first ventilation grooves, and the outer wall of each second cross block is penetrated by a second ventilation groove having the same number and corresponding positions as the first ventilation grooves; The protective layer includes a second expansion chamber provided on the outer wall of the isolation layer, the second expansion chambers being the same in number and corresponding in position to the first expansion chambers, each of the second expansion chambers being filled with expanded graphite, a protruding block being fixedly connected to one end of each second expansion chamber close to the first cross block, each of the protruding blocks being fixedly connected to the inner wall of the armor layer, and a recessed block being fixedly connected to one end of each second expansion chamber close to the second cross block, each of the recessed blocks being capable of slidingly plugging into a corresponding protruding block; Both sides of the plug-in end of each protruding block are fixedly connected with a plurality of sliding blocks that are evenly distributed and symmetrically arranged along the length direction of the cable, and the plug-in end of each protruding block is provided with a plurality of vent holes that are evenly distributed.

2. The fireproof and explosion-proof cable according to claim 1, characterized in that: Both sides of the insertion end of each recessed block are symmetrically provided with sliding grooves with the same number and corresponding positions as the sliding blocks, each sliding block is slidably connected in the corresponding sliding groove, and the outer wall of each recessed block is penetrated by connecting holes with the same number and corresponding positions as the ventilation holes.

3. The fireproof and explosion-proof cable according to claim 2, characterized in that: A side of each recessed block close to the first cross block is fixedly connected to a limit block having the same number and corresponding position as the limit slots on the corresponding first cross block, and each limit block is slidably connected in the corresponding limit slot.

4. The fireproof and explosion-proof cable according to claim 3, characterized in that: When the conductor continues to generate heat, the hot expansion gas in the first expansion chamber will absorb the heat emitted by the conductor and expand. The expansion of the first expansion chamber will squeeze the first cross block to move toward the second cross block. When the first cross block is squeezed by the first expansion chamber and moves to the extreme position of the second cross block, the first ventilation groove and the second ventilation groove are connected to each other.

5. The fireproof and explosion-proof cable according to claim 4, characterized in that: When the first cross block moves toward the second cross block, the limiting groove on the outer wall of the first cross block will drive the recessed block to move by cooperating with the corresponding limiting block. When the first cross block moves toward the second cross block to the extreme position, the vent hole and the connecting hole are connected to each other.

6. The fireproof and explosion-proof cable according to claim 5, characterized in that: When the high temperature outside the outer sheath enters the interior of the cable, the high temperature will be absorbed by the expanded graphite in the second expansion chamber. After the expanded graphite expands, the second expansion chamber will drive the recessed block to move toward the protruding block, so that the vent hole and the connecting hole are staggered with each other.

7. The fireproof and explosion-proof cable according to claim 6, characterized in that: The insulating layer is made of cross-linked polyethylene and the outer sheath is made of polyvinyl chloride, both of which are flame-retardant and wear-resistant materials.

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